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Old 15th February 2013, 02:40 PM   #81
ftpols is offline ftpols  Japan
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Default cyrus 2 amplifier

Quote:
Originally Posted by richie00boy View Post
Check what voltage is actually powering the amp. Put black probe on black speaker output socket and red probe on the end of D5 with the white line, note the voltage reading. Now move the red probe to the end of D7 opposite the white line, note the voltage reading.
Hi, Richie.

I followed your advice and read +38.2v at D5 and -19v at D7
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Old 16th February 2013, 05:42 PM   #82
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38.2 is an expected measurement. It seems that you have something pulling the negative rail voltage down.
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Old 17th February 2013, 01:18 PM   #83
ftpols is offline ftpols  Japan
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Default cyrus 2 amplifier

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Originally Posted by richie00boy View Post
38.2 is an expected measurement. It seems that you have something pulling the negative rail voltage down.
Hi, Richie.

Thanks for the feedback. I will start testing the circuit after I finish the re-cap, and hope you can help me agin when I get stuck.

Cheers!
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Old 1st April 2013, 08:27 AM   #84
ftpols is offline ftpols  Japan
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Default cyrus 2 amplifier

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Originally Posted by ftpols View Post
Hi, Richie.

Thanks for the feedback. I will start testing the circuit after I finish the re-cap, and hope you can help me again when I get stuck.

Cheers!
Hi, Ritchie.

After recapping, I still read -19v at D7 and VR1 output reads -37.9VDC instead of -18V. I replaced the VR1 LM337 and recapped C70 (22mf 25V), which was blown. R119 and D12 (resistor) are now running hot.

Can you or any other Cyrus experts kindly direct me to probable source of the problem? Many thanks!
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